byNASA -- Image and animation courtesy NASA/GSFC/MITI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team.
This asterweb.jpl.nasa.gov/ Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) image of Mt. St. Helens volcano in Washington State was acquired on August 8, 2000 and covers an area of 37 by 51 km. Mount Saint Helens, a volcano in the Cascade Range of southwestern Washington that had been dormant since 1857, began to show signs of renewed activity in early 1980. On 18 May 1980, it erupted with such violence that the top of the mountain was blown off, spewing a cloud of ash... Topics: What -- Advanced Spaceborne Thermal Emission and Reflection Radiometer, What -- ASTER, What --... Source: http://earthobservatory.nasa.gov/IOTD/view.php?id=1028